Roof ladder



H. W HUGHES.

ROOF LADDER. APPLICATION 'FILED JAN 18. I922.

Patented Aug. 29, 1922.

. Snow; W01 6 Horace )V ig/ 105 UNITED S'EATM M er. st i t onner; w.:anenns, or neutron, MAINE,

Roor LADDER. I

laaazaa.

Specification of Letters Patent. i

Application filed January 18, 1922. Serial No. 520,02e.

To all whom it may concern Be it vknown that I, I-IoRAon W. HUcHns,

place.

The primary object of the invention is to construct a wire ladder whichis' strong and durable in construction and will be extremely efficientin operation, and which is constructed of wire members so twistedtogether as to produce the greatest strength at the points desired,

Another object of the invention is to provide a wire ladder which isexceedingly flexible, without departing in any respect from the rigidityof the rung members comprising a portion of the ladder.

With these and other objects in view,

which will be apparent from the description, my invention resides in thenovel combination, construction and operation of parts hereinafterdescribed and claimed and taken in connection with the accompanyingdrawings, which form a part thereof, in which- Figure 1 is a frontelevation of the prefer red form of ladder;

Figure 2, a side elevation thereof;

Figure 3, a horizontal section on the line 33 of Figure 1;

Figure 4, a plan view illustrating the manner of assembling the variouselements comprising the ladder;

Figure 5, a detailed elevation of a modified form of the invention; and

Figure 6, an end elevation of the modification shown in Figure 5.

In the preferred form the invention comprises side members 1 and 2, andrung members 3 formed of heavy spring wire twisted in order to ensurethe desired strength and rigidity, as illustrated in Figure 1. Theladder is formed in detail of wires 4: and 5 which are disposed inparallel spaced relation and on which are laid integral, substantiallyrectangular wire members 6 having upturned end portions 7 and 8, sothatwhen the portion 6 is laid on the wires a and 5 the end 7 of one portionwill abut the end 8 of the adjacent portion. and the sides of themembers 6 will lie in contact with the wires at and 5. The adjacent ends7 and 8 of the respective portions 6 are then twisted upon one another,as illus trated in- Figure 1, to provide a durable and strong rungwhich, owing to the upturned end formation of the portions 7 and 8, willbe spaced away from the body of the ladder the required distance, asbest illustrated in Figure 2. In like manner, the wires 4 and 5 and theside portions of the members 6 are twisted upon one another tostrengthen the side members of the entire ladder.

In the modified form illustrated in Figures 5 and 6, an additional wiresection 9' is inserted between the adjacent ends 7 and 8 of the variousmembers 6 to assist in te te "nu yae, 192

strengthening the'rung members. Thiswire 9 is joined at its oppositeends by suitable fastening to the wires 45' and 5 and is bent upwardlyand outwardly whereby it may be twisted. in with the adjacent ends ofthe rung sections to produce a. greatly strengthened rung member, asillustrated in Figures 5 and 6. While I have illustrated and describedcertain details and materials which enter into the construction,and'operation of the invention, I desire it to be understood that I donot intend to limit myself to these, but that any such may be used aswill fall within the scope of the invention as claimed. I claim: 1. Awire ladder comprising side members, a plurality of substantially loopedwire members disposed on and. extending between said side members, andhaving portions thereof extending along said side members, portions ofadjacent pairs of said looped members being twisted upon each other toform rungs, and the portions of the said looped members extending alongthe side members being twisted thereon.

2. A wire. ladder comprising parallel spaced wires, substantiallyrectangular wire sections disposed on said wires, the ends of saidsections abutting one upon another, and the sides thereof extendingalong said wires, the abutting ends of said sections being twisted uponone another and the sides ofsaid sections being twisted upon said wiresto form the ladder.

3. A wire ladder comprising parallel spaced wires, substantiallyrectangular Wire sections disposed on said wires, and having their endsextending upwardly and laterally from said wires, and arranged inabutting relation, the abutting ends of said sections being twisted uponeach other in lateral spaced relation from said wires to provide rungs,and the side portions of said sections being twisted upon said wires toprovide side members for the ladder. 10

In testimony whereof I affix my signature.

HORACE W. HUGHES.

